Control: tag -1 moreinfo You are using a kernel version that over a year out of date. We will not investigate bugs in that version. You need to upgrade to the current version in Debian 9 "stretch", which is 4.9.110-3+deb9u6.
If the problem is reproducible with the current version, you need to send us the kernel log including the first WARNING and/or BUG messages, not the last ones. Ben. -- Ben Hutchings Klipstein's 4th Law of Prototyping and Production: A fail-safe circuit will destroy others.
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